Dear Laurent,

> > This is weird. Upon rmmodding and re-modprobing the driver, the device
> > file /dev/video0 is deleted and not recreated (why, I don't know).
>
> This is indeed weird. Could you check the kernel log (dmesg) when this
> happens to see if the driver prints any error message ?

Here's the whole shebang:

schlepptop:/home/amelie # lsmod | grep uvc
uvcvideo               75912  0
compat_ioctl32         25984  1 uvcvideo
videodev               52096  2 uvcvideo,compat_ioctl32
v4l1_compat            29444  2 uvcvideo,videodev
usbcore               188248  7 
uvcvideo,snd_usb_audio,snd_usb_lib,usbhid,ehci_hcd,ohci_hcd
schlepptop:/home/amelie # rmmod uvcvideo
schlepptop:/home/amelie # lsmod | grep uvc
schlepptop:/home/amelie # modprobe uvcvideo
schlepptop:/home/amelie # lsmod | grep uvc
uvcvideo               75912  0
compat_ioctl32         25984  1 uvcvideo
videodev               52096  2 uvcvideo,compat_ioctl32
v4l1_compat            29444  2 uvcvideo,videodev
usbcore               188248  7 
uvcvideo,snd_usb_audio,snd_usb_lib,usbhid,ehci_hcd,ohci_hcd
schlepptop:/home/amelie # dmesg
[...]
uvcvideo: Found UVC 1.00 device USB 2.0 Camera (174f:5a31)
uvcvideo: Forcing device quirks 0x4 by module parameter for testing purpose.
uvcvideo: Please report required quirks to the linux-uvc-devel mailing list.
[...]
uvcvideo: Failed to query (1) UVC control 1 (unit 0) : -110 (exp. 26).
[...]
uvcvideo: Failed to query (1) UVC control 1 (unit 0) : -110 (exp. 26).
uvcvideo: Failed to query (1) UVC control 1 (unit 0) : -110 (exp. 26).
usbcore: deregistering interface driver uvcvideo
uvcvideo: Found UVC 1.00 device USB 2.0 Camera (174f:5a31)
uvcvideo: Forcing device quirks 0x4 by module parameter for testing purpose.
uvcvideo: Please report required quirks to the linux-uvc-devel mailing list.
uvcvideo: Failed to query (135) UVC control 1 (unit 0) : -110 (exp. 26).
uvcvideo: Failed to query (129) UVC control 1 (unit 0) : -110 (exp. 26).
uvcvideo: Failed to initialize the device (-5).
usbcore: registered new interface driver uvcvideo
USB Video Class driver (SVN r200)
schlepptop:/home/amelie # ls /dev/video*
ls: Zugriff auf /dev/video* nicht möglich: Datei oder Verzeichnis nicht 
gefunden

> What about '-f yuv' ? :-)

No better, I'm afraid:

[EMAIL PROTECTED]:~> luvcview -f yuv
luvcview version 0.2.1
Video driver: x11
A window manager is available
video /dev/video0
Unable to set format: 5.
 Init v4L2 failed !! exit fatal

Hope this helps,
thanks for all the support,

Amy


-- 
Amelie Zapf ([EMAIL PROTECTED])
Jazz Pianist, Bassist, Composer, Weichselstr. 17, 12045 Berlin, Germany
Don't forget to check out http://www.ameliezapf.com/

"When the power of love overcomes the love of power, the world will know 
peace." - Jimi Hendrix
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